I love using moo.com for all my business cards, stickers and postcards. They offer letterhead now and I just love it. Had to share.
I use the Mini-Cards for my photography above and I use the regular business cards for my “Me Cards” (below) that makes it easy to pass out to people that I come across in life and I want to connect with.

They just introduced letterhead and it’s awesome. Great for handwritten notes that add a little bit of style. What I love is you can upload different designs so you will get different sheets with different designs to use for different things.
MOO Letterhead is customizable like all MOO products, which means full color upload on both sides (at no extra cost) and Printfinity; a different image on every sheet in a pack. It’s a great way to get noticed too – you can put special offers on the back, a product portfolio, or even just a variety of designs in your brand colors. Great for business or personal.
If you don’t have your own logo or imagery, that’s fine – you can choose from a range of exclusive designs and templates. They’ve been created to complement matching designs across our print products, giving you the perfect professional package. So no matter how you choose to personalize your designs with MOO Letterhead, you’re sure to make an impact more than just words.
I like that you can use a simple design on the back or if you want to be creative you could make a collage of images for the back. (mind is racing)
Just wanted to share. Check out Moo.com and they are highly recommended. Great service and product at a great price. Watch for promo’s and also new customers get a discount usually so you can try them.